In order to find the Song of the Four Races, the three alien races have sent representatives to form a "fun search group" with two teleporters of the Earth Ark, they are the teleporters Li Xinying and Angel, and the robot Peter, the Zerg Drow and the Virvir Golia. Their first stop was to go to the Earth Human Society in the Ark of the Earth in search of the Song of the Terrans. Human music culture is at its peak, and it is not easy to find a piece of music that can represent human beings triggering oracles in the long river of times. In order to accomplish the task, the 5 members of the fun search group are now staying in Li Xinying's home in Huaxia City, which makes Li Xinying have a headache, and she protests to the Earth Ark brain "Silver Moon": "Why do you want to let foreign races live in my house? It would be troublesome for me to ask me to be in charge of entertaining them, and the neighbors came to my house curiously and said that they wanted to meet the aliens! I'm going to live here in the future! What should I do if my work encroaches on my private life?"

"Silver Moon", the brain of the earth, said with a slight smile in a rogue tone: "Angel is your best companion to the heart messenger, and she has studied music since she was a child and has a wealth of music knowledge, she came to your house as a guest, entertained the alien race with you, and helped everyone find the song of the four tribes by the way, this is the best arrangement." And the other 3 alien representatives, you can be said to be unfamiliar with each other, and your fate is deep! The leaders of the alien races learned from the "Water Source Project" that it was our Earth Ark that encouraged the creation of literature and art, and promoted the evolution of the soul "Yuan Shen" of the earth human beings during the reincarnation, thus producing the "Yuan Shui" with spiritual power, so the leaders of the alien races were curious about how our unique civilization produced spiritual power. Therefore, this time, they sent representatives of their races to learn more about the life and civilization of human beings on the earth, so please entertain them! If your private life is affected by work, we will compensate you, don't worry. Please!"

Li Xinying can only reluctantly accept the task of entertaining aliens at home. She recalled her warm home, where she had her father, mother and younger brother, and now she was the only one left, but she was actually a little afraid to return home, only to see a hollow home with walls on all sides. Opening the door of the house, Angel and Li Xinying walked into the house arm in arm, and the robot Peter, the Zerg Drow and the Virgin Giant's Govia also walked into the house one after another, curiously looking at and touching the furnishings and furniture in Li Xinying's house. Li Xinying arranged for them to sit on the comfortable and soft sofa, and then brought drinks and fruits from the refrigerator in the kitchen at home to entertain the guests. Govia of the Virgin Giants first took a big sip of juice, then looked around, looked at Li Xinying's family photo hanging on the wall, and said curiously, "This is home, such a small living unit, four humans have lived here for many years, don't you feel bored?"

Pointing to the family photo, Li Xinying, whose eyes were red, choked up and said, "This is my parents, this is my twin brother, since my brother and I were born, our family has lived here happily, this is my home!"

Govia of the Virgilant Clan was a little depressed and said, "Is it that four humans with the closest blood relationship live together in one place, and that place is home? From birth to growth, our Giantess lived in a collective institution, when I was a child, I lived in a school, and when I grew up, I was admitted to a job and lived in the dormitory of my workplace. Of course, if we have a lover who loves each other after work, we can apply to the clan mother to form a family, lovers are not like your human couples, one-on-one, our lovers can be more than 1, 4 lovers form a family, is the most common. And our lovers come when they get along, go if they don't, and lovers who don't get along well can dissolve the family at any time, return to singleness or form another family. It's so convenient!"

Angel asked curiously, "If the family is dissolved, what will happen to the children born in the family?"

"The birth of a child is arranged by the mother, and we have only one gender, and the adult Virgo only needs to donate eggs, so that the mother can conceive the child through an artificial womb through genetic modification technology, and the child will live and grow in a collective institution after birth. All children are born equal, and when they grow up, they are arranged to work in a way that is capable. It's hard to imagine that you humans can live with blood people for a lifetime, it's a little scary to think about!"

Angel explains: "We humans live and grow up with our parents and siblings, and when we grow up, we form separate families with the people we love, we conceive children in the family, and when we raise our children, we grow up and then we form another family with the people we love. That's how we humans thrive. We will also meet many friends who are not related by blood throughout our lives, and we will grow up together. Relatives and friends at home are our most precious spiritual treasures and give us the driving force for survival. Of course, family, love, and friendship can all bring us troubles, but with these emotions, we live more colorful lives. And the songs that human beings sing about family, love, and friendship are even more constant, so we are troubled, and that is the song of the human race that can represent our human beings on the earth."

Zerg Drow said proudly: "My mother is the mother queen, our entire race is one big family, everyone divides labor and cooperates, so that our race can find a place to live in the vast universe, my family members are thousands, everyone has the same heart, their respective brain domains are connected, I am very proud of my home."

Robot Peter smiled and said, "We robots don't need to have a home, each of us has grown up since birth, and we are connected to our civilization network, interconnected, and information sharing, so it can be said that we have an existence close to immortality."

Li Xinying stroked her forehead, thinking that the alien race is fundamentally different from our earth human beings, so can we really achieve the harmony of the four races and find the song of the four races?

Angel thought for a moment and said, "Why don't I play a song that is popular in the Ark of Earth and celebrates love, called "My Love". The song is sung in the language of the earth, and the content tells the story of two men and women who love each other from the chance to meet each other and know each other.

Li Xinying dimmed the lights in the room, transmitted the song in the light brain to the sound system at home, the melodious song sounded, the male and female lovers sang this love song together, the voice was tactful and listening, and Angel was trying to use telepathy to transmit the picture she thought of after hearing the song to the minds of the alien race, so that they could feel the affection even if they couldn't understand the content of the song. At the end of the song, Govia of the Virgilant clan was moved to tears, and she said: "Hearing this song makes me want to fall in love as soon as possible."

Zerg Zhuoer hesitated and said, "I'm sorry, we Zerg can't sing, and we don't have a musical heritage. It was the first song I heard and I felt comfortable with the sound, and that's it! If it weren't for the images that Angel telepathically transmitted to us, I would not have known that the ups and downs of this sound originally contained the emotions you were talking about. In fact, there is only one emotion for our Zerg, and that is the loyalty of the mother emperor and the entire race, and we don't have any other feelings. So I think it's extremely difficult to find the Song of Inheritance that represents our Zerg from ancient times to the present."

Robot Peter said more coldly: "Your song called "My Love" is just a combination of sound waves with ups and downs, high and low, for me sound waves, light waves and electromagnetic waves are just physical phenomena of different wavelengths, and the picture that Angel transmitted to me telepathically is only an independent light and shadow video, and has nothing to do with that section of sound waves. It can be said that we robot people do not have a heritage called music. This may disappoint you! It's probably an impossible task to find a song that represents our robot family!"

Li Xinying said unrelentingly: "It may be that we don't know much about the so-called music, humans and the Virgilant clan have their own musical heritage, but this does not mean that there is only one form of music. Maybe the Zerg and the Robot Clan have their own unique musical heritage, and although they may be different from the musical forms of our Earth humans and the Virgil Clan, there should still be hope to find a song that can represent the four races."

The group of 5 people who live in Li Xinying's house, Li Xinying and Angel lead the other 3 alien friends every day to watch movies, operas, art exhibitions and exhibitions of human history and relics on the earth, taste authentic food, and also lead them to wander the streets and alleys, looking for small handicraft workshops, and watching different handicraft creations such as clothing, pottery, origami, and beauty painting. This surprised the three alien friends, because they did not expect that human civilization is so colorful, and at the same time, they also sighed at how much energy this civilization needs to consume. Gottwi of the Giantess clan is obsessed with costume design and beauty painting, and every day she uses Li Xinying to configure her light brain, searching for all kinds of images and information related to clothing design, learning cutting and sewing skills, and trying to design her own clothes that fit. In addition to bread, he also fell in love with red bean paste, ice cream and rock sugar snow fungus syrup, and he loved soybean products to the extreme, clamoring for soy milk, tofu flowers and stinky tofu every day, as well as all vegetarian foods made from soybeans. And what is surprising is that Peter, the robot who does not eat fireworks in the world, neither likes to dress up nor love food, but falls in love with the role-playing game on the light brain, and teams up with other players on the Internet every day to solve puzzles and tasks together, just in just one week, he has earned tens of thousands of contribution points in exchange for god-level game magic weapons, in short, he can't stop playing. During this time, Li Xinying and An Qi were not idle or lazy, except for entertaining these 3 alien friends, they listened to thousands of music songs every day, hoping to find a song that could represent the human race, but found nothing.

Li Xinying took out the golden Shiqin that she carried with her in a small leather bag, and saw the four dusty gems on the qin, she thought that the red gem should represent the human beings on the earth, she carefully wiped the Shiqin with a cloth, and then put it back into the small leather bag she wore beside her. Tonight is the Thanksgiving night of the Ark of the Earth on November 11, and Li Xinying and her group of 5 people arrived at the opera house in the center of Huaxia City to participate in the Thanksgiving concert. Zerg Drow and Robot Peter reluctantly attend the concert, but Li Xinying promises to prepare a tofu feast for Zerg Drow, and she also promises Robot Peter to buy him the latest popular game magic weapon, so they are reluctant to attend the concert. The orchestra of the concert hall is singing the theme song of Thanksgiving "Aan die Freude", also known as "Ode to Happiness", in the ancient German language of the earth, the lyrics of which are poems written by the German poet Schiller in 1785 A.D., and later accompanied by the fourth movement of Beethoven's Symphony No. 9, which can represent the joy of human beings when they first arrive in the inner world and find the promised land in despair, so this song has become the theme song of Thanksgiving on behalf of the inner earth. When this song sounded, Li Xinying saw Shiqin glowing brightly and trembling slightly, she hurriedly took out Shiqin from her purse, and saw that the ruby on Shiqinqin's body was shining, she heard a sigh, as if someone whispered in her ear: "This is the first song of the four races, the "Ode to Happiness" of the human race." And Angel and their 3 alien friends all stared at Shiqin, listening to the resounding "Ode to Happiness" in their ears, and instantly they saw the hope of life, yes, this is the song of the human race "Ode to Happiness".